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Azure offers many load balancing solutions , and these products could be used as a load balancer options. These options are not directly supported by ESRI and the EGIS team would be responsible for supporting these options (with the help of our Microsoft colleagues).
Traffic manager
Azure traffic manager is a simple DNS switch that can route to a pool of public addresses. The priority and distribution of network traffic can be defined in many ways. A traffic manager is crucial in the implementation of disaster recovery and will be in place in our production instance.
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Comparing uptimes of each approach
Service | % Uptime | Minutes down/30days |
|---|---|---|
VM | 99.9% | 43.83 |
App Gateway | 99.95% | 21.92 |
Load Balancer | 99.99% | 4.38 |
Traffic Manager | 99.99% | 4.38 |
-- | -- | -- |
Paired VMs [1] | 99.95% | 21.92 |
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Uptime percentages were converted to downtimes using the table found on Wikipedia's page on high availability
Calculating an overall SLA
If we treat each tier independently, which is a worst-case assumption, we can calculate an overall system uptime by multiplying each component uptime ref . This yields an estimated overall uptime as follows:
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